postinst is in init-system-helpers 1.29ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #!/bin/sh
set -e
# See http://bugs.debian.org/722524
if dpkg --compare-versions "$2" lt "1.9"; then
if [ -d /var/lib/systemd/deb-systemd-helper-enabled ]; then
find /var/lib/systemd/deb-systemd-helper-enabled -type f -exec chmod 644 '{}' \;
fi
fi
exit 0
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